CITY OF LOS ANGELES' BENCHMARKING STUDY OF CURED-IN-PLACE PIPE (CIPP) STRUCTURAL LINER THICKNESS

The City of Los Angeles (City) operates and maintains more than 6500 miles of sewers serving more than 4 million people. The sewers range in size from 6″ to 150″, the oldest built in 1878. In time sewers corrode, develop structural defects, or become hydraulically inadequate.Rehabilitation of sewers with plastic liners is a relatively new phenomenon. In order to optimize liner installation, the City and the consulting firm of LEE & RO, Inc. embarked on a benchmarking study to review its criteria and policies. The study was limited to CIPP only in order to control the size and scope of the report.This paper presents the study, the recommendations, and the implemented decisions. The conclusions drawn will be shown over time with the CIPP structural liner thickness reduced. The cost reduction will be the savings from material cost, and the long term savings by the increase in competitive bids.